Underfeed-furnace.



No. 674,548. Panama may 2|, |9ol.

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UNDERFEED FURNACE.

(Application led Dec. 24, 1900,) (No Model.) A 2 Sheets-Sheet I,

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FDEIDUDI l on. D, cA we nqnms wmns co.. vnoumo.. WASH Ncrr No. 674,548. Patented May 2|, |90l. W. R. WOOD.

UNDERFEED FURNACE.

2 Sheets-Sheet 2.

(Application led Dec 24, 1900.) (No Model.)

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UNITED STATES .PATENT Fries.

VILERED ROTHERY WOOD, OF LONDON, ENGLAND, ASSIGNOR TO THE AMERICAN STOKER COMPANY, OF NEW YORK, vN. Y.

UNDERFEED-FURNACE.

SPECIFICATION forming' part 0f Letters .Patent No. 674,548, dated May 21, 1901.

l Application filed December 24, 1900. Serial No. 40,940. (No model.)

T all r11/1.0m, it may concern:

Be it known that I, WILFRED ROTHERY WOOD, a citizen of the United States, residing in London, England, have inventedacertain new and useful Improvement in Underfeed-Furnaces, of which the following is a specification.

The method of feeding fuel from below to furnaces is well known, and for the purpose of feeding it has been customary to employ a pusher or screw, which will carry the fuel to a fuel-trough, in which it gradually rises, becoming partially coked, and eventually it is pushed out of the trough onto the hearth of the furnace.

The present invention relates to improved apparatus by which the undue caking of the fuel is prevented and the draft is enabled to enter more freely into the mass, in addition to which a more even and Wider distribution of the fuel over the furnace-bed may -be secured.

One of the main features of the invention is to have a part of the fuel-trough movable,

line A A of Fig. 2, which in turn is acrosssectional elevation on the line B B of Fig. l.

In said drawings the inner hollow bars a of the rocking grate rest upon a bead b or are otherwise pivotally connected with the fuelfeed casing o, and they may also be provided with draft-openings d, directed toward the fuel-space rising therefrom. In like manner the lower ends of the other bars a, are provided with trunnions e or. are otherwise secured to or move on some fixed part, such as barfof the structure, so as to secure a riS- ing-and-falling motion or rocking of the bars, all of which on each side of the fuel-space being connected by a link or bar g, so that they will move in unison. The desired movement may be imparted by means of a crank 7L or cam operating a cross-slide t', which in turn operates levers or rods j, connected to some part of the movable grate-bar system, such as to the downwardly-projecting web of one of the bars a., or other means of imparting motion may be employed. Motion may be imparted to the crank h by a shaft kand gears Z m, driven from the feed-screw shaft o of feed-Screw p. 1

With the construction as illustrated it will beobvious that as the fuel rises in the trough it will be subjected to a to-and-fro motion across the trough at approximately right angles to its line of rise, 'and such motion tends to break up the caked fuel and prevent its adhering to the sides and further tends to keep the draft-ports dclear, and thus permits the air to enter freely among Vthe fuel. After the fuel leaves the trough it will be subjected to a further rising-and-falling motion as it passes over the other bars a, and thus will be constantly kept in a broken or divided condition, which enables the draft passing through the bars to enter thoroughly into it and secure complete combustion Without smoke.

For the purpose of collecting the ashes carried down from bar t0 bar a trough 'n may be employed, or such ashes may fall into convenient ash-pits.

1. In apparatus for underfeeding fuel to furnaces, the combination with feeding devices, of a fuel-feed trough with movable sides, and means for imparting motion to such sidesY so as to cause the fuel to move backward and forward across its line of rise, substantially for the purposes set forth.

2. In apparatus for underfeeding fuel to furnaces, the combination with feeding devices, of a fuel-'feed trough with movable sides, a series of stepped and movable gratebars, and means for imparting motion to the trough sides and grate-bars, substantially for the purposes set forth.

3. In apparatus for underfeeding fuel to furnaces, the combination with feeding de- Vices, of a fuel-feed trough with movable In testimony whereof I have hereunto set sides, a series of stepped and movable gratemy hand in the presence of two subscribing bars, a shaft driven from the feed meohzm- Witnesses.

ism, and connecting-rods operated thereby WILFRED ROTHERY WOOD. adapted to impart motion to the trough and Witnesses:

grate-bars, substantially for the purposes set ALLEN PARRY JONES,

forth. E. CoTsWoRTH. 

